For the quantification of auxin, cytokinin, gibberellin and brassinosteroid, 1 g of fresh berries was ground in a mortar and homogenized in extraction solution (9 ml of PBS, pH 7.2–7.4) for enzyme-linked immunosorbent assay (ELISA) [49 (link)]. The ELISA procedures were conducted according to the instructions provided by the manufacturer (Enzyme-linked biological technology Co., LTD., Shanghai, China) on the Thermo Labsystems AC8 and Labsystems Multiskan MS 352 (Thermo Labsystems Co., Vantaa, Finland).
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